Complete rework on the code.  Fixed renderSlideshowParserFunction() calling a non-existant function.  Renamed explode_assoc to explodeArguments, cleaned up the logic, and put in error checking.  Added documentation to everything.  Changed the hook registration to use the standardized $wgHooks[ParserFirstCallInit] method.  Fixed renderSlideshowTag() calling the non-static renderSlideshow() function statically.  Cleaned up the hooks file formatting.